There have been issues with Autopilot in general in the past month or so. A little delay is expected, however, the issue you are experiencing could be specific to your tenant and opening a case with MS is the best option here which you have already done. I am afraid there isn't much one can do here.
Autopilot profile assignment delay upto 6hrs
AsAdmin
396
Reputation points
Hi team,
From last 3monts , we are facing a strange issue where autopilot profile is getting assigned to device after 3-4hrs sometime 6hrs of delay.
This issue is happing for both dynamic group and assigned group where device is added manually and also using dynamic query with order ID.
i have raised case with MS a month a go, but no resolution was provided by Azure ad and Intune team and mentioned its expected behavior, but i don't thing is expected behavior.
Microsoft Security | Intune | Enrollment
Microsoft Security | Intune | Enrollment
Registering devices with Intune for management and policy enforcement
Microsoft Security | Intune | Other
Microsoft Security | Intune | Other
Other Intune-related topics, including unsupported scenarios and platform-specific behaviors